He posted: "Well, you know, we don't have that movie on the horizon, but the idea for it was to have Hellboy finally come to terms with the fact that his destiny, his inevitable destiny, is to become the beast of the Apocalypse, and having him and Liz face... that part of his nature.

"And he has to do it in order to be able to ironically vanquish the foe that he has to face in the third film.

"He has to become the best of the Apocalypse to be able to defend humanity, but at the same time he becomes a much darker being. It's a very interesting ending to the series, but I don't think it will happen."